Shamone comes from the Michael Jackson song "Bad" released in 1987. It is a distinctive deliberate mispronunciation of "come on" used frequently by Jackson, occasionally spelt "cha'mone", "jamone" or more commonly "shamone".

Today shamone can be used pretty much the same way "word" is commonly used.

He Heeee! That shit is crazy mo fo!
It is not popularised by Bo Selecta, nor does it mean Show More! It is in fact popularised by Michael Jackson himself and if you check the lyrics of BAD by the man himself he is actually saying C'mon which means "come on" which means shamoooooonnneee!! You wanna check my body? They be lookin at at me wiv desire thats what you say right?!!!!

.He Heeee! That shit is crazy mo fo!
It is not popularised by Bo Selecta, nor does it mean Show More! It is in fact popularised by Michael Jackson himself and if you check the lyrics of BAD by the man himself he is actually saying C'mon which means "come on" which means shamoooooonnneee!! You wanna check my body? They be lookin at at me wiv desire thats what you say right?!!!!

According to Spike Lee, from his Bad 25 documentary, "Shamone" "isn't just a cool way to say "come on," but MJ's tribute to soul singer Mavis Staples, who used it in a live version of "I'll Take You There" in 1975."

Source : vulture.com

See the video where "Shamone" was first used by YouTubing Mavis Staples- I'll Take You There